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RGP750:
Slight hold on last post. I ran a short ride night before last and limped home on 1 and 2 cylinder.
Traced problem to no fuel coming from the Tap tube feeding 3 and 4., Tank off Tap off clean everything
blow out everything, put on new fuel pipes,(in case a spider was left in the original pipes).
Ran ok ,only in drive way,but of course bowls were full, same problem tonight only 1 and 2 cold ,i had switched the pipes on the tap..
Just taken tank off again ,this time put tap on reserve and fuel isn't coming out of the front pipe,if i put my finger over the back one with fuel coming out fuel then flows from the front pipe si it isn't blocked just seems to be some sort of vacuum being formed.
If no one has any idea it looks like DS will be getting another £50.
Cheers Rich :-[

Green1:
I think these tanks vent through the cap if you open it does fuel come out of the tap then

Mick

RGP750:
Hi
Yes tried that and it's fine.
it's only one of the tap outlets that wont seem to work for some reason.
The weird thing is it was fine for 12 miles the night before last then  suddenly
just cut out and only fueled 2 carbs.
Rich

Green1:
How is the packing valve behind the tap part 4 schematic I think it works in similar way to the valve in my airless spraygun any damage or deformity it stops working 

http://www.cmsnl.com/honda-cb750k2-four-england_model14363/partslist/F11.html#results

Mick

RGP750:
Yes the rubber seems ok. I can't get my head around it stopping working.
Just taken it apart again, the rear tube has the direct flow from the tank so will potentially
have priority over the front tube which has an internal 90 degree drilling from the rear tube.
Whichever pair of carbs is supplied by the front tube is starved of fuel,very weird.

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